Capital gains tax is not a big revenue raiser, with the Office for Budget Responsibility (OBR) estimating that total capital gains tax receipts will be £15.2 billion in 2024/25, which represents 1.3% of all receipts. However, if Labour introduces measures to increase tax revenue, a rate rise would be an option as part of a package. One possibility is that Labour could look to increase rates of capital gains tax at the next Budget, set for 30 October. But when would an increased rate apply from?
It is impossible to completely rule out a mid-year rate change, but it is unlikely. The then Chancellor, George Osborne, caught many off guard by announcing an increase in the rate of capital gains tax from 18% to 28% from midnight on 22 June 2010. So there is precedent for this, but it is more usual for a rate change to come into effect at the start of a new tax year.
The time between announcement and implementation is then used by many to make disposals to lock in the current rates, and this jump in disposals is a boost to the public finances, as despite being treated more beneficially for the taxpayer it accelerates tax collection.